| # SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note |
| # |
| # (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved. |
| # |
| # This program is free software and is provided to you under the terms of the |
| # GNU General Public License version 2 as published by the Free Software |
| # Foundation, and any use by you of this program is subject to the terms |
| # of such GNU license. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, you can access it online at |
| # http://www.gnu.org/licenses/gpl-2.0.html. |
| # |
| # |
| |
| * Arm protected memory allocator for Mali GPU device drivers |
| |
| Required properties: |
| |
| - compatible: Must be "arm,protected-memory-allocator" |
| |
| The protected memory allocator manages allocation of physical pages of a |
| reserved memory region of protected memory, therefore its device node shall |
| reference a reserved memory region. |
| |
| In addition to that, the protected memory allocator shall be referenced |
| by the GPU. |
| |
| A complete example configuration for the device tree: |
| |
| reserved-memory { |
| #address-cells = <2>; |
| #size-cells = <2>; |
| ranges; |
| |
| mali_protected: mali_protected@c0000000 { |
| compatible = "mali-reserved"; |
| reg = <0x0 0xc0000000 0x0 0x1000000>; |
| }; |
| }; |
| |
| gpu_protected_memory_allocator: protected-memory-allocator { |
| compatible = "arm,protected-memory-allocator"; |
| memory-region = <&mali_protected>; |
| }; |
| |
| gpu_fpga: gpu@0x6e000000 { |
| compatible = "arm,mali-midgard"; |
| reg = <0x0 0x6e000000 0x0 0x200000>; |
| interrupts = <0 168 4>, <0 168 4>, <0 168 4>; |
| interrupt-names = "JOB", "MMU", "GPU"; |
| clocks = <&scpi_dvfs 2>; |
| clock-names = "clk_mali"; |
| protected-memory-allocator = <&gpu_protected_memory_allocator>; |
| operating-points = < |
| /* KHz uV */ |
| 50000 820000 |
| >; |
| }; |
| |
| The protected memory allocator is gpu_protected_memory_allocator. |
| It references the mali_protected reserved memory region and, in turn, |
| it is referenced by the GPU as protected-memory-allocator. |